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Credits: Beam

Year of Invention: 2015

Description: Hitting Knitting Flashes LED. Counterintuitive: operates without closed circuit. (Not for charging cell phones!)

Materials: Outside- different polyester yarns, inside polyester amoflex and paper on aluminum, rectifier bridge, bright LED

Techniques: Lace knitting with polyester thread on KH-940, inside, sandwich of polyester foil and paper, backside aluminum tape, connected to a rectifier bridge with an LED. Flash – energy comes from friction or potential energy (distance variation).

References/Inspirations:

tribo-electric effect:
http://research.microsoft.com/pubs/132492/p29-villar.pdf
http://www.disneyresearch.com/wp-content/uploads/Project_PaperGenerators_uist2013_paper1.pdf

Dimensions:

160 x 110 mm

Link:

Making of:

https://myfablab.wordpress.com/2015/07/05/knitting-the-2015-swatch/

https://myfablab.wordpress.com/2015/07/12/linking-the-2015-swatch/

Preliminary research on different materials: (from Summercamp 2013 and 2014 Doggy Bag)

https://energyharvestingresearch.wordpress.com/2015/01/14/nano-energy/

Nano Energy experiment is part of a research on Design & Energy Harvesting.

Photo:

sw1

Circuit Diagram:

Where green is polyester amoflex with aluminum foil, or paper on foil. Connected to rectifier bridge or 4 diodes, and bright LED. The rectifier bridge is especially added in this relatively small setup.

Screen Shot 2015-05-23 at 20.22.16
You can leave the rectifier bridge and resistor out, and/or use two LED’s like this: (used for the rubbing case, which has bigger surfaces of material)
Screen Shot 2015-05-23 at 20.43.32
Tribo electric effect’s are a bit unreliable though :-)

Just an idea: can the rectifier bridge be made of LED’s?

Materials and value of tribo effect:
https://www.trifield.com/content/tribo-electric-series/

Knitted image = response curve on oscilloscope:

screen-shot-2015-07-05-at-08-16-49 frontside-backside

  voltcraft19_4 response curve on the oscilloscope.

Experimenting with different materials (bigger surface, rubbing, friction):

16285323971_8bccf75a96_b

Lace knitting done with the old (first) knittic.com board, using my own software.

2014-10-14 09.42.19

https://myfablab.wordpress.com/2014/10/11/doing-invisible-knitted-datavisualisation/

Lace knit is combining a thicker and a thinner thread using a machine knitter (KH-940), different effects of alternating the threads are possible.

lace

Knitting the swatch:

https://myfablab.wordpress.com/2015/07/05/knitting-the-2015-swatch/

Linking the swatch:

https://myfablab.wordpress.com/2015/07/12/linking-the-2015-swatch/

 

 

 


1 Comment so far

  1. […] Description of this swatch can be found here:http://etextile-summercamp.org/swatch-exchange/flash-knit/ […]

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